8. Tentukan persamaan garis yang melalui titik ( 2 , -3 ) dan sejajar garis 5x – y = 8 !

Jawaban:

8.5x -y =8

-y = -5x +8

y = 5x -8

y = 5

m = 5

sejajar => m1 =m2 = 5

y-y1 = m(x-x1)

y+3 = 5(x-2)

y+3= 5x -10

y = 5x -10-3

y = 5x -13

y -5x +13 =0

9.y -2x =5

y = 2x +5

y = 2

m = 2

tegak lurus => m1 xm2 = -1

2x m2 = -1

m2 = -1/2

y-y1 = m(x-x1)

y-6 = -1/2(x+2)

y-6= -1/2x -1

y = -1/2x -1+6

y = -1/2x +5

2y= -x +10

2y + x -10 =0